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Business acquisitions and dispositions - Acquisition of Q9 Networks Inc. Summary (Details) - CAD ($)
$ in Millions
Dec. 31, 2017
Oct. 03, 2017
Dec. 31, 2016
Disclosure of detailed information about business combination [line items]      
Goodwill $ 10,428   $ 8,958
Q9      
Disclosure of detailed information about business combination [line items]      
Cash consideration   $ 170  
Fair value of previously held interest in Q9 and favourable purchase option   131  
Note receivable from Q9   517  
Total cost to be allocated   818  
Trade and other receivables   19  
Other non-cash working capital   (39)  
Property, plant and equipment   311  
Finite-life intangible assets   267  
Long-term debt   (7)  
Deferred tax liabilities   (69)  
Other non-current liabilities   (16)  
Total costs to be allocated, excluding cash and cash equivalents and goodwill   466  
Cash and cash equivalents   12  
Fair value of net assets acquired   478  
Goodwill   $ 340